during the stimulation Na+comes inside and then what happens to tha negetively charged proteins?

Dear Student.
Please find below the solution to the asked query.

If sodium ion starts entering inside the membrane, this reverse the polarity across the membrane. The process is known as depolarization. The rapid inflow of Na+ ions causes the membrane potential to increase, thereby generating an action potential. As a result of which inner membrane becomes more positive as compared to outside. This results into generation of concentration gradient which further leads to the opening of integral channel proteins. So to balance the concentration gradient both inside and outside, potassium ions starts diffusing out of the membrane. The negatively charged protein molecules present inside the neuron cannot cross the membrane​.
 
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